CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 28, 2012	Jul. 30, 2011	Jul. 28, 2012	Jul. 30, 2011
Net revenue	$ 816,104	$ 897,520	$ 1,612,455	$ 1,699,922
Operating costs and expenses:
Cost of goods sold	381,839	378,117	748,161	712,592
Research and development	264,175	249,604	520,145	492,141
Selling and marketing	41,034	40,390	81,100	78,542
General and administrative	25,718	23,631	51,423	48,415
Amortization and write-off of acquired intangible assets	13,023	11,138	27,378	25,479
Total operating costs and expenses	725,789	702,880	1,428,207	1,357,169
Operating income	90,315	194,640	184,248	342,753
Interest and other income, net	5,864	2,064	6,921	1,846
Income before income taxes	96,179	196,704	191,169	344,599
Provision for income taxes	3,105	4,312	3,552	5,346
Net income	$ 93,074	$ 192,392	$ 187,617	$ 339,253
Net income per share:
Basic	$ 0.17	$ 0.32	$ 0.33	$ 0.54
Diluted	$ 0.16	$ 0.31	$ 0.32	$ 0.53
Weighted average shares:
Basic	562,362	608,511	571,193	623,728
Diluted	570,325	623,132	582,532	640,136
Cash dividend declared per share:	$ 0.06		$ 0.06